21052738 has 8 divisors (see below), whose sum is σ = 36090432. Its totient is φ = 9022596.

The previous prime is 21052729. The next prime is 21052739. The reversal of 21052738 is 83725012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21052739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751870 + ... + 751897.

It is an arithmetic number, because the mean of its divisors is an integer number (4511304).

Almost surely, 2^21052738 is an apocalyptic number.

21052738 is a deficient number, since it is larger than the sum of its proper divisors (15037694).

21052738 is a wasteful number, since it uses less digits than its factorization.

21052738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503776.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21052738 is about 4588.3262743619. The cubic root of 21052738 is about 276.1231771827.

The spelling of 21052738 in words is "twenty-one million, fifty-two thousand, seven hundred thirty-eight".